My son added an after market 2 inch receiver to his Subaru WRX wagon. The hitch failed (cracked). The bike rack was 3 inch so he had to use a reducer.
Having said that, his bikes weigh 46 pounds each. Yours are probably a lot lighter.
I strongly encourage you to make sure that the bikes are cabled to the frame. That way if the fall off for any reason you will drag them behind you instead of leaving it in on the road for someone else to drive over. You probably need a security cable/lock anyway. That could probably be used.
Have someone follow you and observe how much movement is occurring to the bikes. You might want to use ropes or bungee cords to reduce the motion if it is excessive.
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